diff --git a/init.lua b/init.lua
index 122ea87..5104970 100644
--- a/init.lua
+++ b/init.lua
@@ -78,7 +78,7 @@ end
 local load_module, get_resource, loadfile_exports
 modlib = setmetatable({
 	-- TODO bump on release
-	version = 64,
+	version = 65,
 	modname = minetest and minetest.get_current_modname(),
 	dir_delim = rawget(_G, "DIR_DELIM") or "/",
 	_RG = setmetatable({}, {
diff --git a/persistence.lua b/persistence.lua
index 602e0d1..15512f7 100644
--- a/persistence.lua
+++ b/persistence.lua
@@ -3,140 +3,140 @@ local files = {}
 local metatable = {__index = lua_log_file}
 
 function lua_log_file.new(file_path, root)
-    local self = setmetatable({file_path = assert(file_path), root = root}, metatable)
-    if minetest then
-        files[self] = true
-    end
-    return self
+	local self = setmetatable({file_path = assert(file_path), root = root}, metatable)
+	if minetest then
+		files[self] = true
+	end
+	return self
 end
 
 function lua_log_file:load()
-    -- Bytecode is blocked by the engine
-    local read = assert(loadfile(self.file_path))
-    local env = {}
-    setfenv(read, env)
-    read()
-    env.R = env.R or {{}}
-    self.reference_count = #env.R
-    self.root = env.R[1]
-    self.references = modlib.table.flip(env.R)
+	-- Bytecode is blocked by the engine
+	local read = assert(loadfile(self.file_path))
+	local env = {}
+	setfenv(read, env)
+	read()
+	env.R = env.R or {{}}
+	self.reference_count = #env.R
+	self.root = env.R[1]
+	self.references = modlib.table.flip(env.R)
 end
 
 function lua_log_file:open()
-    self.file = io.open(self.file_path, "a+")
+	self.file = io.open(self.file_path, "a+")
 end
 
 function lua_log_file:init()
-    if modlib.file.exists(self.file_path) then
-        self:load()
-        self:_rewrite()
-        self:open()
-        return
-    end
-    self:open()
-    self.root = {}
-    self:_write()
+	if modlib.file.exists(self.file_path) then
+		self:load()
+		self:_rewrite()
+		self:open()
+		return
+	end
+	self:open()
+	self.root = {}
+	self:_write()
 end
 
 function lua_log_file:log(statement)
-    self.file:write(statement)
-    self.file:write"\n"
+	self.file:write(statement)
+	self.file:write"\n"
 end
 
 function lua_log_file:flush()
-    self.file:flush()
+	self.file:flush()
 end
 
 function lua_log_file:close()
-    self.file:close()
-    self.file = nil
-    files[self] = nil
+	self.file:close()
+	self.file = nil
+	files[self] = nil
 end
 
 if minetest then
-    minetest.register_on_shutdown(function()
-        for self in pairs(files) do
-            self.file:close()
-        end
-    end)
+	minetest.register_on_shutdown(function()
+		for self in pairs(files) do
+			self.file:close()
+		end
+	end)
 end
 
 -- TODO use shorthand notations
 function lua_log_file:dump(value)
-    if value == nil then
-        return "nil"
-    end
-    if value == true then
-        return "true"
-    end
-    if value == false then
-        return "false"
-    end
-    if value ~= value then
-        -- nan
-        return "0/0"
-    end
-    local _type = type(value)
-    if _type == "number" then
-        return ("%.17g"):format(value)
-    end
-    if self.references[value] then
-        return "R[" .. self.references[value] .. "]"
-    end
-    self.reference_count = self.reference_count + 1
-    local reference = self.reference_count
-    self.references[value] = reference
-    local formatted
-    if _type == "string" then
-        formatted = ("%q"):format(value)
-    elseif _type == "table" then
-        local entries = {}
-        for _, value in ipairs(value) do
-            table.insert(entries, self:dump(value))
-        end
-        for key, value in pairs(value) do
-            if type(key) ~= "number" or key % 1 ~= 0 or key < 1 or key > #value then
-                table.insert(entries, "[" .. self:dump(key) .. "]=" .. self:dump(value))
-            end
-        end
-        formatted = "{" .. table.concat(entries, ";") .. "}"
-    else
-        error("unsupported type: " .. _type)
-    end
-    local key = "R[" .. reference .."]"
-    self:log(key .. "=" .. formatted)
-    return key
+	if value == nil then
+		return "nil"
+	end
+	if value == true then
+		return "true"
+	end
+	if value == false then
+		return "false"
+	end
+	if value ~= value then
+		-- nan
+		return "0/0"
+	end
+	local _type = type(value)
+	if _type == "number" then
+		return ("%.17g"):format(value)
+	end
+	if self.references[value] then
+		return "R[" .. self.references[value] .. "]"
+	end
+	self.reference_count = self.reference_count + 1
+	local reference = self.reference_count
+	self.references[value] = reference
+	local formatted
+	if _type == "string" then
+		formatted = ("%q"):format(value)
+	elseif _type == "table" then
+		local entries = {}
+		for _, value in ipairs(value) do
+			table.insert(entries, self:dump(value))
+		end
+		for key, value in pairs(value) do
+			if type(key) ~= "number" or key % 1 ~= 0 or key < 1 or key > #value then
+				table.insert(entries, "[" .. self:dump(key) .. "]=" .. self:dump(value))
+			end
+		end
+		formatted = "{" .. table.concat(entries, ";") .. "}"
+	else
+		error("unsupported type: " .. _type)
+	end
+	local key = "R[" .. reference .."]"
+	self:log(key .. "=" .. formatted)
+	return key
 end
 
 function lua_log_file:set(table, key, value)
-    table[key] = value
-    if not self.references[table] then
-        error"orphan table"
-    end
-    self:log(self:dump(table) .. "[" .. self:dump(key) .. "]=" .. self:dump(value))
+	table[key] = value
+	if not self.references[table] then
+		error"orphan table"
+	end
+	self:log(self:dump(table) .. "[" .. self:dump(key) .. "]=" .. self:dump(value))
 end
 
 function lua_log_file:set_root(key, value)
-    return self:set(self.root, key, value)
+	return self:set(self.root, key, value)
 end
 
 function lua_log_file:_write()
-    self.references = {}
-    self.reference_count = 0
-    self:log"R={}"
-    self:dump(self.root)
+	self.references = {}
+	self.reference_count = 0
+	self:log"R={}"
+	self:dump(self.root)
 end
 
 function lua_log_file:_rewrite()
-    self.file = io.open(self.file_path, "w+")
-    self:_write()
-    self.file:close()
+	self.file = io.open(self.file_path, "w+")
+	self:_write()
+	self.file:close()
 end
 
 function lua_log_file:rewrite()
-    if self.file then
-        self.file:close()
-    end
-    self:_rewrite()
-    self.file = io.open(self.file_path, "a+")
+	if self.file then
+		self.file:close()
+	end
+	self:_rewrite()
+	self.file = io.open(self.file_path, "a+")
 end
\ No newline at end of file